irradiation of dissolving pulp by electron beams - Lenzing

Economical considerations. . The price of
irradiated of pulp is composed of high costs of
botlh investment and Operation, the latter one
mainly depending on expenses for electric
power. From this Point of view, the irradiation of
pulp would become an economically interesting
innovation only if it is possible to carry out the
viscose process with drastically reduced input
chemicals (22% CS*, AR: 0.5) without any
impairment of the fiber quality.
Experimental
For the experiments at lab plant and Pilot plant,
50 sheets (isostack) of Solucell 450 were
irraldiated at STUDER AG with a 1OMeV
Rhodotron TT300 accelerator built by IBA.
The viscose quality was evaluated by PVC and
KWP filter value (constant pressure) and particle
i
-
I
Irradiated Pulp fl2 kCy)
BA: 10 MeV
homogeneous nking of prllp chips
Steeping lye concentratioe: 16%
/ Viscose of the sanuz composition was prepared for irradiated and
-.
LAB PLANT
Viscose Quality
Viscose Rheology I
- -----.~-~~--~ _-_- - - ---~~_
66
count. The viscose was also characterized by
rheological investigations and analysis of
byproducts, see Table 1 and Figure 1.
No optimization of spinning conditions was done
for these experiments.
Table 1. Viscose composition for the experiments at lab
plant and Pilot plant.
Plant CS2 (%) AR Ce11 conc.
Lab 36 0.6
Lab 32 0.6
Lab’ 28 0.55
Lab 26 0.5
Lab 22 0.5
Lab 28 0.55
Lab
Pilot
Figure 1. Experimental setup.
--
28
22
0.475
0.5
Standard
Standard
Standard
Standard
Standard
Standard +
15.6%
Standard +
15.6%
Standard
Con~entionai Ageiag
Sieeping lye co~~~~~rati~a Standard
-.--I--~ --.x .._““